Work-holder.



M. E. CLARK.

WORK HOLDER.

APPLICATION FILED Alma, 191e.

3 SHEETS -YSHEL'T f1 M. E. CLARKi WORK HOLDER.

APPUCA'HON mm AUG.

MASON EDWIN CLARK, or SEATTLE, WASHINGTON.

WORK-HOLDER.'

assises.

i Specification of Letters Patent. Patentd Jun@ 2:5, 19H1?,

Application led August 8, 1916.v Serial No. 113,715.

To all whomz't may concern:

Be it known that I, MASON EDWIN CLARK, a citizen of the United States,lresiding at Seattle, in the county of King and State of lVashington,have invented certain new and useful Improvements in Mrk-Holders,

of which the following is a specification.

ThisI invention relatesv vto devices for .clamping work upon the tablesof drill presses or other machines.- l

The object of my improvements 1s to proc vide a device of this characterwhich is Aeiiicient in operation, and ,may be readily applied ordetached from the work.

A further object is to afford self adjustfable means which willaccommodate itself to work having'an uneven or irregular con- .vice ininoperative condition.

figuration to reliably hold the same in a predetermined position on themachin'etable.

The invention is of inexpensive and durable construction and will provepeculiarly advantageous in shops engaged in the manufacture o fmechanical parts in quantities.V

The invention is illustrated in the accompanying drawings, whereinFigure 1 is a plan view of the work holder shown applied upon aportionof a machine table. Fig. 2 is a side elevation of the device, with thesupporting table shown in longitudinal section. Fig. 3 is a transversesectional view through 3-3 of Fig. 2. Fig. 4 is a detail View showing inside elevation the rear end of the deview similar to Fig. 2, with thedevice represented as holding down work of a somewhatvdilferentcharacter than that illustrated in the referred to view. v

Figs. 6 and 7 are transverse sectional views taken through 6-6 and 7-57of Fig. 5. Fig. 8 is a fragmentary view'of one of the gripping bars toshow the slot adjacent to the.

rear end thereof. 1

In carrying out the present invention, l provide a stand of asubstantially U-shape in transverse section consisting of a relativelylarge and flat base element 1() and two plate elements 11 extendingupwardly from each side of the base element. Seated upon the latter, andbetween the side elements 11 of the stand is a cam 12 having. av handle13.

through whichextends the central portion of a pin 16, whose ends passthrough vertically arranged guide slots 17 provided in the Standelements. Provided on the eccentric, or the handle, as shown, is alaterally di- 20 acting .against the' side of the cam site to the rack.Said sprin provided with a stud 201 (Fig. 1) adapted to Fig. 5 is a Saidcam is provided with a hole 15 rected lip or pawllelement 18 forengaging in a suitably disposed notch of a rack 19 for securing the camin a selected rotary position and iit isthus maintained by a springoppois furthermore engage in a depression 21 of the cam when the cam isarrested by a stop4 22 on the rack vers disposed at opposite sides ofthe aforesaid cam anda fulcrum post'25 which is secured to the machinetable 26 in proximity to the place whereat the work W is to be secured.The levers are connected with the cam by means of the pin 16 whichextends through elongated holes, such as 27, Fig. 8, provided in therear ends of the levers.

Said fulcrum post is detach-ably connected` to the Atable 26 byproviding a screw 28 on the post to extend through a 'selected tableSlot, as 29, to receive a Securing nut 30.

The post is provided with a series of holes 31 to accommodate a fulcrumpin 32 as in Figs. 2 and 3, or a number of such pins as 32, 321 shown inFigs. 5 and 6.

33 represents a supplementary pin which maybe employed in ahole of thefulcrum post to reinforce a subj acent fulerum pin, as 321 Figs. 5 and6, and'for which end the pin 33 is provided at its outer end with adownwardly directed limb 331L which terminates in a concavity 332adapted to seat upon the associated pin 321.

The operation of the invention is as folfin the inoperativel position inwhich itis .shown in Fig. 4. 24 and 241 represent lemay be utilized asin the referred to' views. I

Being thus arranged, the operator actuates the cam 12 through theinstrumentality of its handle 13 to effect the elevation ofthe pivotalpin 1G to elevate the latter until the lever arms which are connectedthereto are sufiicient-ly raised to cause the other arms to bear downupon the work to clamp the same tothe table. As this occurs, the spring20 asserts itself to push the arm lip 18 into en- .gagemnt with als mail"of the rack was which it Will register. In thus manipulating 'the cam,the operator may exercise aside pressure upon thevhandle in oppositionto the spring or he'may allow the lip to progresi sively click in thevariousnotches traversed.

Without inconveniencing the operator of the device and to accommodatethetilting'of the pin 16 which couples the levers tothe cam,

spacing collars 34 With convex ends 35 are provided on the pin 16-between the levers and the adjacent side elements 11' of the 20 stand. l

What vI claim as my invention is l. Ina device of the characterdescribed, apair of levers, a fulcrum post adapted to be fixedly securedto a work-table and provided with a plurality of holes,V a fulcrum-A.'pin adapted to be inserted in a selected one i of said holes, a standconsisting of a baseand two spaced side elements, said side elementsbeing furnished With guide slots, a cam having its periphery seated onthe base element of said stand,. a pin extending through the lcam andthe two levers and Ibeing guided in the aforesaid cam slots,

means to rotatably move the cam to actuate said levers, andmeans toreleasably secure the cam in clampmg positionswith respect ,to thelevers.

2. Ina device of the character described, a pair of Work-clampinglevers, .a fulcrum pin therefor, means adapted to be fixedly secured toa. work table for holdingsaid ful- -lday of July, 1916.

crum pin at selected elevations, a cam operatively connected to saidlevers, means tof,

operate the cam for actuating the levers, a

rack, and a pawl provided on the cam and engagea-ble-in the rack forsecuring the cam *in position to actuate the levers.

3. In a device of the character described, a pair of work-clampinglevers, a Afulcrum post having a series of holes, -fulcrurn pins adaptedto'be employed in selected of saidholes, a supplementary pin insertiblein one of the post holes to reinforce one of" the `aforesaid pins atitsouter end, and lmeans v Y wherebyl the leversl may be influencedtoeffect the clamping of the Work in place.

" 4f.. In a device of `the class described,'a

pair of levers, a fulcrum post disposed be-l tween the levers near theirforward ends, a

fulcrum pin engageable vWith said post atga selected elevation, a camdisposed between the rear ends of the levers, and means for operativelyconnecting the cam to the levers whereby the latter affordindependentver-i tical movements relativeto each other.

5. In a device of the vcharacter described,

a pair of clamping levers, an adjustable fuli crum serving for both ofthe levers, astand, a cam connected with bothA of the levers forsimultaneously operating the same,v arack,

, a pawlelement provided on the cam and engageable with the teeth ofsaid rack, a', spring tending to maintain the cam in position to engagesaid-pawl, and means provided on the spring for yieldingly holding the`cam in inoperative position with respect to said levers. l

Signedl atSeattlc, Washington, this 81st i A M. EDWINCLARK.

Witness: 'I E. PETERSON. i

